Interfacial friction makes the vertical structure of lithium metal batteries

Interfacial friction makes the vertical structure of lithium metal batteries

summary

A practical high-energy-density lithium metal battery requires a free-standing lithium metal anode with a thickness of less than 20 μm, but it is difficult to achieve large-scale processing of thin layers and free-standing structures due to the low melting point and strong diffusion creep effect of lithium metal. In this study, a free-standing lithium chips with a thickness of 5 to 50 μm was formed on the lithium metal surface by mechanical rolling, which was determined by the in-situ tribochemical reaction between lithium and zinc dialkyl dithiophosphate (ZDDP). A layer of organic/inorganic hybrid interface (about 450 nm) was formed on the lithium metal surface with extremely high hardness (0.84 GPa) and Young's modulus (25.90 GPa), which not only enables scalable processing of lithium chips, but also realizes dendrite-free lithium metal anode by inhibiting dendrite growth. The rolled lithium anode has a long cycle life and high-rate cycling stability ( more than 1700 cycles at 25°C even at current densities of 18.0 mA cm −2  and 1.5 mA cm −2  ). This work provides a scalable tribological design approach for producing practical thin free-standing lithium metal anodes.

Single-sided pole piece production

 Single-sided pole piece manufacturing method

This issue introduces the production process of single-sided pole pieces to help you obtain satisfactory data results in experimental tests.

1. Stirring

The first step is the preparation of the slurry. The equipment used are "high-speed variable frequency mixer" and "beaker".

High speed variable frequency mixer

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Learning about Lithium-ion Button Cell Batteries

 1. Basic introduction of lithium-ion button battery

Button lithium-ion battery is a rechargeable battery that uses lithium ions as charge carriers. It consists of positive electrode, negative electrode, electrolyte and diaphragm. The positive electrode usually uses lithium compounds, such as lithium cobalt oxide, lithium iron phosphate, etc. The negative electrode generally uses graphite material. The electrolyte is an organic solution containing lithium salts that can provide a medium for ion transmission. The diaphragm is used to isolate the positive and negative electrodes to prevent short circuits.

In-depth! Detailed explanation of lithium-ion battery formation technology

In-depth! Detailed explanation of lithium-ion battery formation technology

Lithium-ion battery production requires formation to achieve electrode wetting and full activation of electrode materials. During the first charge, as lithium ions are embedded in the negative electrode, the electrolyte components undergo a reduction reaction at the negative electrode to form a stable solid electrolyte interface film (SEI film) to prevent irreversible consumption of electrolyte and lithium ions in subsequent cycles.

Therefore, this technology is of extraordinary significance to battery performance. The effect of formation directly affects the subsequent performance of lithium-ion batteries, including storage performance, cycle life, rate performance and safety. This article focuses on the technical parameters/methods of formation and its impact on battery performance.

Why do electrodes crack during lithium battery coating? How to solve it?

1. Detailed reasons for the cracking of the pole piece

1. Slurry problem

   The slurry viscosity is not suitable:

     - Viscosity is too high: The slurry has poor fluidity, making it difficult to spread evenly during coating and prone to cracking.

     - Viscosity is too low: The slurry tends to flow, resulting in uneven coating thickness and cracking after drying.

  Uneven slurry dispersion:

     - Active materials, conductive agents and binders are not fully dispersed, resulting in local stress concentration.

     - Agglomerated particles exist in the slurry, forming weak points during coating.

Lithium battery principle, formula and process flow

Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the intercalation and deintercalation of Li+ between two electrodes. With the continuous development of downstream industries such as new energy vehicles, the production scale of lithium-ion batteries is expanding. This article takes lithium cobalt oxide as an example to comprehensively explain the principle, formula and process flow of lithium-ion batteries, the performance and testing of lithium batteries, production precautions and design principles.

1. The principle, formula and process flow of lithium-ion batteries;

1. Working Principle

1. Positive electrode structure

LiCoO2 + conductive agent + binder (PVDF) + current collector (aluminum foil)

 2. Negative electrode structure

Graphite + Conductive agent + Thickener (CMC) + Binder (SBR) + Current collector (Copper foil) 

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Research progress on pre-lithiation types of silicon-based anodes and compatible binders

Pre-lithiation of silicon-based anode

Preface

With the development of society and the advancement of science and technology, energy consumption is increasing day by day, environmental pollution is also becoming increasingly serious, and has seriously threatened the future survival of mankind. Therefore, it is urgent to develop clean and environmentally friendly renewable energy. However, most renewable energy sources such as wind energy and solar energy are unstable and intermittent, while batteries can directly convert chemical energy into electrical energy, which is not only stable but also has high energy conversion efficiency, which can effectively alleviate the energy pressure we are facing now. Among them, lithium-ion batteries have been rapidly developed due to their advantages such as high energy density, long cycle life, and environmental friendliness, and are widely used in the fields of electronic products and electric vehicles.